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Welcome to the 8051 Microcontroller MCQs Page

Dive deep into the fascinating world of 8051 Microcontroller with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of 8051 Microcontroller, a crucial aspect of Computer Architecture. In this section, you will encounter a diverse range of MCQs that cover various aspects of 8051 Microcontroller, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Computer Architecture.

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Check out the MCQs below to embark on an enriching journey through 8051 Microcontroller. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Computer Architecture.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of 8051 Microcontroller. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

8051 Microcontroller MCQs | Page 2 of 14

Q11.
DJNZ R0,label is how many bit instruction?
Discuss
Answer: (a).2
Q12.
JZ, JNZ, DJNZ, JC, JNC instructions monitor the bits of which register ?
Discuss
Answer: (d).PSW
Q13.
Calculate the jump code for again and here if code starts at 0000H

MOV R1,#0
MOV A,#0
MOV R0,#25H
AGAIN:ADD A,#0ECH
JNC HERE
HERE: INC R1
DJNZ R0,AGAIN
MOV R0,A
END
Discuss
Answer: (c).E9,01
Discuss
Answer: (b).the address next to the call instruction
Q15.
LCALL instruction takes
Discuss
Answer: (c).3 bytes
Q16.
Are PUSH and POP instructions are a type of CALL instructions?
Discuss
Answer: (b).no
Q17.
What is the time taken by one machine cycle if crystal frequency is 20MHz?
Discuss
Answer: (b).0.60 micro seconds
Q18.
Find the number of times the following loop will be executed

MOV R6,#200
BACK:MOV R5,#100
HERE:DJNZ R5, HERE
DJNZ R6,BACK
END
Discuss
Answer: (d).20000
Discuss
Answer: (c).address 05H is stored in the accumulator
Q20.
Does the two instructions mean the same?
1) BACK: DEC R0

JZ BACK

2) BACK: DJNZ RO, BACK
Discuss
Answer: (b).no
Page 2 of 14

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